USRE41315E1 - Modulators of dopamine neurotransmission - Google Patents

Modulators of dopamine neurotransmission Download PDF

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USRE41315E1
USRE41315E1 US11/904,013 US90401300A USRE41315E US RE41315 E1 USRE41315 E1 US RE41315E1 US 90401300 A US90401300 A US 90401300A US RE41315 E USRE41315 E US RE41315E
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phenyl
piperazine
propyl
compound
trifluoromethyl
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Clas Sonesson
Bengt Andersson
Susanna Waters
Nicholas Waters
Joakim Tedroff
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Saniona AB
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NSAB Filial af Neurosearch Sweden AB
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    • C07D295/04Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms
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    • C07D211/06Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members
    • C07D211/08Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hydrocarbon or substituted hydrocarbon radicals directly attached to ring carbon atoms
    • C07D211/18Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hydrocarbon or substituted hydrocarbon radicals directly attached to ring carbon atoms with substituted hydrocarbon radicals attached to ring carbon atoms
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    • C07D295/04Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms
    • C07D295/08Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms substituted by singly bound oxygen or sulfur atoms
    • C07D295/096Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms substituted by singly bound oxygen or sulfur atoms with the ring nitrogen atoms and the oxygen or sulfur atoms separated by carbocyclic rings or by carbon chains interrupted by carbocyclic rings

Definitions

  • the present invention relates to new modulators of dopamine neurotransmission, and more specifically to new substituted 4-(phenyl N-alkyl)-piperazines and 4-(phenyl N-alkyl)-piperidines, and use thereof.
  • Dopamine is a neurotransmitter in the brain. Since this discovery, made in the 1950s, the function of dopamine in the brain has been intensely explored. To date, it is well established that dopamine is essential in several aspects of brain function including motor, cognitive, sensory, emotional and autonomous (e.g. regulation of appetite, body temperature, sleep) functions. Thus, modulation of dopaminergic function may be beneficial in the treatment of a wide range of disorders affecting brain functions. In fact, both neurologic and psychiatric disorders are treated with medications based on interactions with dopamine systems and dopamine receptors in the brain.
  • Drugs that act, directly or indirectly, at central dopamine receptors are commonly used in the treatment of neurologic and psychiatric disorders, e.g. Parkinson's disease and schizophrenia.
  • dopaminergic pharmaceuticals have severe side effects, such as extrapyramidal side effects and tardive dyskinesia in dopaminergic antagonists used as antipsychotic agents, and dyskinesias and psychoses in dopaminergic agonists used as anti-Parkinson's agents.
  • Therapeutic effects are unsatisfactory in many respects.
  • novel dopamine receptor ligands with selectivity at specific dopamine receptor subtypes or regional selectivity are sought for.
  • dopamine receptor agonists i.e. dopamine receptor ligands with some but not full intrinsic activity at dopamine receptors, are being developed to achieve an optimal degree of stimulation at dopamine receptors, avoiding excessive dopamine receptor blockade or excessive stimulation.
  • the object of the present invention is to provide new pharmaceutically active compounds, especially useful in treatment of disorders in the central nervous system, which do not have the disadvantages of the above described substances.
  • the compounds of the present invention have unexpectedly been found to act preferentially on dopaminergic systems in the brain. They have effects on biochemical indices in the brain with the characteristic features of dopamine antagonists, e.g. producing increases in concentrations of dopamine metabolites.
  • the compounds of this invention surprisingly show a dopaminergic action profile with clear antagonist like effects on brain neurochemistry but no, or mild, antagonist like effects, on normal behavior, they can activate animals with a low baseline activity, but can also inhibit behavior in states of hyperactivity.
  • the action profile suggests modulatory effects on dopaminergic functions, clearly different from known compounds belonging to these chemical classes or effects anticipated of typical dopamine receptor antagonists or agonists from these or other chemical classes.
  • the novel class of dopaminergic modulators presented in this invention may prove superior to presently known dopaminergic compounds in the treatment of several disorders related to dysfunctions of the CNS, in terms of efficacy as well as side effects.
  • Some compounds of this invention have been found to have surprisingly good pharmacokinetic properties including high oral bioavailability. They are thus suitable for the preparation of orally administered pharmaceuticals. There is no guidance in the prior art how to obtain compounds with this effect on dopamine systems in the brain.
  • the present invention relates to new di-substituted 4-(phenyl-N-alkyl)-piperazines and di-substituted 4-(phenyl-N-alkyl)-piperidines in the form of free base or pharmaceutically acceptable salts thereof, process for their preparation, pharmaceutical compositions containing said therapeutically active compound and to the use of said active compound in therapy.
  • An objective of the invention is to provide a compound for therapeutic use, and more precisely a compound for modulation of dopaminergic systems in the mammalian brain including man. It is also an objective of the invention to provide a compound with therapeutic effects after oral administration.
  • the present invention is directed toward substituted 4-(phenyl N-alkyl)-piperazine or 4-(phenyl-N-alkyl)-piperidine compounds of Formula 1: wherein:
  • ADHD attention deficit hyper activity disorder
  • tic disorders such as Gilles de la Tourette's syndrome and other tic disorders.
  • speech disorders such as stuttering may improve. They may also be for regulating pathological disorders of food, coffee, tea, tobacco, alcohol and addictive drug intake and also to improve mental disorders associated with psychoactive substance overuse (including alcohol) including hallucinations, withdrawal symptoms, delusions, mood disorders, sexual and cognitive disturbances.
  • Anxiety disorders obsessive-compulsive disorder and other impulse control disorders, post traumatic stress syndrome, personality disorders, and conversion hysteria may also be treated with the compounds in the invention.
  • Other indications include sleep disorders, “jet lag” and disorders of sexual functions.
  • Neurological indications include the treatment of Huntington's disease, movement disorders such as dyskinesias including other choreas as well as primary, secondary and paroxysmal dystonias, tardive movement disorders such as tardive dyskinesia and tardive dystonia as well as other drug induced movement disorders.
  • Restless legs, periodic leg movements and narcolepsy may also be treated with compounds included in the invention. They may also improve mental and motor function in Parkinson's disease, and in related parkinsonian syndromes such as multiple system atrophies, progressive supranuclear palsy, diffuse Lewy body disorder and vascular parkinsonism. They may also be used to ameliorate tremor of different origins.
  • the compounds in the invention can also be used for the treatment of vascular headaches such as migraine and cluster headache, both as acute and prophylactic treatment. They may improve rehabilitation following vascular or traumatic brain injury. Moreover, they may be used to relieve pain in conditions characterized by increased muscle tone.
  • One preferred compound is 4-(4-chloro-3-trifluoromethyl-phenyl)-1-propyl-piperidine, further illustrated in Example 9.
  • it has no significant inhibition on spontaneous behavior; 1287 ⁇ 272 cm/30 min (for controls) vs. 944 ⁇ 114 cm/30 min at 50 ⁇ mol/kg s.c.
  • it affect the locomotor activity of habituated rats from 1381 ⁇ 877 cm/60 min (for the controls) to 1300 ⁇ 761 cm/60 min at 50 ⁇ mol/kg s.c.
  • 4-(4-chloro-3-trifluoromethyl-phenyl)-1-propyl-piperidine has an oral availability (F) of 55% in rat.
  • 1-propyl-4-(3-trifluoromethyl-phenyl)-piperazine is not a substance according to the present invention.
  • 1-propyl-4-(3-trifluoromethyl-phenyl)-piperazine has an oral availability (F) of 9,5% in rat.
  • 1-(4-Chloro-3-nitro-phenyl)-4-propyl-piperazine shows the desired properties.
  • d-amphetamine induced hyperactivity is demonstrated by cis-4-(3,4-dichloro-phenyl)-2,6-dimethyl-1-propyl-piperazine, which is the compound of Example 35.
  • the compounds according to the invention are especially suitable for treatment of disorders in the central nervous system, and particularly for treatment of dopamine mediated disorders. They may, e.g. used to ameliorate symptoms of mood disorders, in obesitas as an anorectic agent and in other eating disorders, to improve cognitive functions and related emotional disturbances, to improve cognitive and motor dysfunctions associated with developmental disorders, to improve all symptoms of psychosis, including schizophrenia and schizophreniform disorders, to improve ongoing symptoms as well as to prevent vent the occurrence of new psychotic episodes, to regulate pathological disorders due to intake of food, coffee, tea, tobacco, alcohol and addictive drugs etc.
  • the compounds according to the invention can thus be used to treat symptoms in e.g.:
  • the synthesis of the present compounds is carried out by methods that are conventional for the synthesis of related known compounds.
  • the syntheses of compounds in Formula 1, in general, comprise the reaction of an intermediate that supplies the alkyl group with an intermediate piperidine or piperazine that supplies the amine group of Formula 2:
  • a convenient method of synthesis of the present compounds is by use of an alkyl iodide (e.g. 1-propyl-iodide).
  • alkyl iodide e.g. 1-propyl-iodide
  • other leaving groups besides iodide may be used on the alkyl group, of course, such as sulfonates, particularly methanesulfonate or toluenesulfonate, bromo and the like.
  • the alkyl intermediate is reacted with the appropriate amine in the presence of any convenient acid scavenger.
  • the usual bases such as alkali metal or alkaline earth metal carbonates, bicarbonates and hydroxides are useful acid scavengers, as are some organic bases such as trialkylamines and trialkanolamines.
  • Compounds of Formula 3: wherein X ⁇ N is accomplished by reacting compounds of Formula 4: with compounds of Formula 5: where Z is a leaving group like iodide.
  • Other leaving groups besides iodide may be used on the alkylgroup, of course, such as sulfonates, particularly methanesulfonate or toluenesulfonate, bromo and the like.
  • the alkyl intermediate is reacted with the appropriate amine in the presence of any convenient acid scavenger.
  • the usual bases such as alkali metal or alkaline earth metal carbonates, bicarbonates and hydroxides are useful acid scavengers, as are some organic bases such as trialkylamines and trialkanolamines.
  • the reaction is performed in a suitable solvent such as n-butanol by heating at about 50-150° C.
  • the catalyst preferably Pd will have the ability to form ligand complex and undergo oxidative addition.
  • Typical Pd catalysts will be Pd 2 (dba) 3 (wherein dba refers to di-benzylidene acetone), Pd(PPh 3 ) 4 , Pd(OAc) 2 , or PdCl 2 [P (o-tol) 3 ] 2 and typical phosphine ligands will be BINAP, P(o-tol) 3 , dppf, or the like.
  • the usual bases such as alkali metal or alkaline earth metal carbonates, bicarbonates and alkyloxides are useful acid scavengers, as are some organic bases such as trialkylamines and trialkanolamines.
  • the reaction medium for such reactions may be any convenient organic solvents, which are inert to the basic conditions; acetonitrile, toluene, dioxane, NMP (N-methyl-2-pyrrolidone), DME (dimethoxyethane), DMF (N,N-dimethylformamide), DMSO (dimethylsulfoxide) and THF (tetrahydrofuran) solvents are useful.
  • organic solvents such as from ambient temperature to the reflux temperature of the reaction mixture, particularly from 50° C. to about 120° C.
  • the reaction may be carried out between compounds of Formula 8: wherein Y is, for example, a dialkylborane, dialkenylborane or boronic acid (e.g. BEt 2 , B(OH) 2 ) or a trialkyltin (e.g. SnMe 3 , SnBu3), and an aryl substituted with a leaving group of Formula 7: (for definition of Z, see above) in the presence of a base and a zerovalent transition metal catalyst such as Pd or Ni, according to known methods (Chem. Pharm. Bull., vol 33, 1985, 4755-4763, J. Am. Chem. Soc., vol. 109, 1987, 5478-5486., Tetrahedron Lett., vol.
  • Y is, for example, a dialkylborane, dialkenylborane or boronic acid (e.g. BEt 2 , B(OH) 2 ) or a trialkyltin (e.g. SnM
  • Y can also be a zink- or magnesium-halide group (e.g. ZnCl 2 , ZnBr 2 , ZnI 2 , MgBr, MgI) according to known methods (Tetrahedron Lett., vol. 33, 1992, 5373-5374, Tetrahedron Lett., vol. 37, 1996, 5491-5494 ).
  • ZnCl 2 , ZnBr 2 , ZnI 2 , MgBr, MgI zink- or magnesium-halide group
  • the catalyst preferably Pd will have the ability to form ligand complex and undergo oxidative addition.
  • the definition of ligands, bases and solvents, is mentioned above.
  • the transition metal catalyzed cross-coupling coupling reaction can be performed with the opposite substitution pattern: with an heteroaryl/alkenyl substituted with an leaving group of Formula 10: in the presence of a base and a zerovalent transition metal catalyst such as Pd or Ni, according known methods discussed in the previous paragraph.
  • Compounds of Formula 11 can be prepared by catalytic hydrogenation of the tetrahydropyridine or pyridine from the previous paragraph, using standard methods known in the art, generally with palladium on carbon, PtO 2 , or Raney nickel as the catalyst.
  • the reaction is performed in an inert solvent, such as ethanol or ethyl acetate, either with or without a protic acid, such as acetic acid or HCl.
  • an inert solvent such as ethanol or ethyl acetate
  • protic acid such as acetic acid or HCl.
  • arylhalides of Formula 7 wherein Z is Cl, Br, or I
  • alkyllithium reagents for example, butyllithium, sec-butyllithium or tert-butyl-lithium, preferably butyllitium or Mg (Grignard reaction) in an inert solvent.
  • Suitable solvents include, for example ether or tetrahydrofuran, preferably tetrahydrofuran. Reaction temperatures range from about ⁇ 110° C. to about 0° C.
  • the intermediate lithium anions or magnesium anions thus formed may then be further reacted with a suitable electrophile of Formula 12: wherein A is defined as a protecting group like t-Boc (tert-butoxycarbonyl), Fmoc (fluorenylmethoxycarbonyl), Cbz (benzyloxycarbonyl) or an alkylgroup like benzyl.
  • A is defined as a protecting group like t-Boc (tert-butoxycarbonyl), Fmoc (fluorenylmethoxycarbonyl), Cbz (benzyloxycarbonyl) or an alkylgroup like benzyl.
  • the intermediates of formula 13: which are formed require that the hydroky group be removed so as to result in compounds of Formula 1 (X ⁇ CH or C). This step may be accomplished by one of several standard methods known in the art.
  • a thiocarbonyl derivative for example a xanthate
  • a free radical process for example a free radical process, of which are known to those skilled in the art.
  • the hydroxyl group may be removed by reduction with a hydride source such as triethylsilane under acidic conditions, using such as, for example, trifluoroacetic acid or boron trifluoride.
  • the reduction reaction can be performed neat or in a solvent, such as methylene chloride.
  • a further alternative would be to first convert the hydroxyl group to a suitable leaving group, such as tosylate or chloride, using standard methods. The leaving group is then removed with a nucleophilic hydride, such as, for example, lithium aluminium hydride.
  • This last reaction is performed typically in an inert solvent, such as, ether or tetrahydrofuran.
  • Another alternative method for removing the hydroxyl group is to first dehydrate the alcohol to an olefin with a reagent such as Burgess salt (J. Org. Chem., vol 38, 1973, 26) followed by catalytic hydrogenation of the double bond under standard conditions with a catalyst such as palladium on carbon.
  • the alcohol may also be dehydrated to the olefin by treatment with acid such as p-toluenesulfonic acid or trifluoroacetic acid.
  • the protecting group, A is removed under standard conditions known by those skilled in the art.
  • t-Boc cleavages are conveniently carried out with trifluoroacetic acid either neat or in combination with methylene chloride.
  • F-moc is conveniently cleaved off with simple bases such as, ammonia, piperidine, or morpholine, usually in polar solvents such as DMF and acetonitrile.
  • A is Cbz or benzyl
  • these are conveniently cleaved off under catalytic hydrogenation conditions.
  • the benzyl group can also be cleaved off under N-dealkylation conditions such as treatment with ⁇ -chloroethyl chloroformate (J. Org. Chem., vol 49, 1984, 2081-2082 ).
  • a radical R1 in a compound of the Formula 1 into another radical R1, e.g. by oxidizing methylsulfide to methylsulfone (for example by m-chloroperoxybenzoic acid), substitution of a triflate or halide group with a cyano group (for example palladium catalyzed cyanation), substitution of triflate or halide group with a ketone (for example palladium catalyzed Heck reaction with butyl vinyl ether), substitution of a triflate or halide group with a carboxamide (for example, palladium catalyzed carbonylation), or cleaving an ether by, for example, converting a methoxy group into the corresponding hydroxyl derivate, which can further be converted into the corresponding mesylate or triflate.
  • mesylate and triflate refers to OSO 2 CH 3 , CH 3 SO 3 or OSO 2 CF 3 , CF 3 SO
  • C 1 -C 4 alkyl refers to an alkyl containing 1-4 carbon atoms in any isomeric form.
  • the various carbon moieties are defined as follows:
  • Alkyl refers to an aliphatic hydrocarbon radical and includes branched or unbranched forms such as methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl.
  • cycloalkyl refers to a radical of a saturated cyclic hydrocarbon such as cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl.
  • patient refers to an individual in need of the treatment and/or prevention according to the invention.
  • treatment used herein relates to both treatment in order to cure or alleviate a disease or a condition, and to treatment in order to prevent the development of a disease or a condition.
  • the treatment may either be performed in an acute or in a chronic way.
  • Both organic and inorganic acids can be employed to form non-toxic pharmaceutically acceptable acid addition salts of the compounds of this invention.
  • Illustrative acids are sulfuric, nitric, phosphoric, hydrochloric, citric, acetic, lactic, tartaric, palmoic, ethane disulfonic, sulfamic, succinic, cyclohexylsulfamic, fumaric, maleic, and benzoic acid.
  • These salts are readily prepared by methods known in the art.
  • the pharmaceutical composition containing a compound according to the invention may also comprise substances used to facilitate the production of the pharmaceutical preparation or the administration of the preparations.
  • substances are well known to people skilled in the art and may for example be pharmaceutically acceptable adjuvants, carriers and preservatives.
  • the compounds used according to the present invention will normally be administered orally, rectally, or by injection, in the form of pharmaceutical preparations comprising the active ingredient either as a free base or as a pharmaceutically acceptable non-toxic, acid addition salt, such as the hydrochloride, lactate, acetate, sulfamate salt, in association with a pharmaceutically acceptable carrier.
  • the carrier may be a solid, semisolid or liquid preparation.
  • the active substance will constitute between 0.1 and 99% by weight of the preparation, more specifically between 0.5 and 20% by a weight for preparations intended for injection and between 0.2 and 50% by weight for preparations suitable for oral administration.
  • the selected compound may be mixed with a solid excipient, e.g. lactose, saccharose, sorbitol, mannitol, starches such as potato starch, corn starch or amylopectin, cellulose derivatives, a binder such as gelatine or polyvinylpyrrolidine, and a lubricant such as magnesium stearate, calcium stearate, polyethylene glycol, waxes, paraffin, and the like, and then compressed into tablets.
  • a concentrated sugar solution which may contain e.g.
  • the tablet can be coated with a polymer known to the man skilled in the art, dissolved in a readily volatile organic solvent or mixture of organic solvents. Dyestuffs may be added to these coatings in order to readily distinguish between tablets containing different active substances or different amounts of the active compound.
  • the active substance may be admixed with e.g. a vegetable oil or polyethylene glycol.
  • Hard gelatine capsules may contain granules of the active substance using either the mentioned excipients for tablets e.g. lactose, saccharose, sorbitol, mannitol, starches (e.g. potato starch, cornstarch or amylopectin), cellulose derivatives or gelatine.
  • liquids or semisolids of the drug can be filled into hard gelatine capsules.
  • Dosage units for rectal application can be solutions or suspensions or can be prepared in the form of suppositories comprising the active substance in a mixture with a neutral fatty base, or gelatine rectal capsules comprising the active substance in admixture with vegetable oil or paraffin oil.
  • Liquid preparations for oral application may be in the form of syrups or suspensions, for example solutions containing from about 0.2% to about 20% by weight of the active substance herein described, the balance being sugar and mixture of ethanol, water, glycerol and propylene glycol.
  • Such liquid preparations may contain coloring agents, flavoring agents, saccharine and carboxymethylcellulose as a thickening agent or other excipients known to the man in the art.
  • Solutions for parenteral applications by injection can be prepared in an aqueous solution of a watersoluble pharmaceutically acceptable salt of the active substance, preferably in a concentration of from 0.5% to about 10% by weight. These solutions may also containing stabilizing agents and/or buffering agents and may conveniently be provided in various dosage unit ampoules. The use and administration to a patient to be treated in the clinic would be readily apparent to an ordinary skill in the art.
  • the present invention is also considered to include stereoisomers as well as optical isomers, e.g. mixtures of enantiomers as well as individual enantiomers and diastereomers, which arise as a cosequense of structural asymmetry in certain compounds of the instant series. Separation of the individual isomers is accomplished by application of various methods which are well known to practitioners in the art.
  • an effective amount or a therapeutic amount of the compounds of the invention are from about 0.01 to about 500 mg/kg body weight daily, preferably 0.1-10 mg/kg body weight daily.
  • the compounds may be administered in any suitable way, such as orally or parenterally.
  • the daily dose will preferably be administered in individual dosages 1 to 4 times daily.
  • the animals were placed in separate motility meter boxes 50 ⁇ 50 ⁇ 50 cm equipped with an array of 16 ⁇ 16 photocells (Digiscan activity monitor, RXYZM (16) TAO, Omnitech Electronics, USA), connected to an Omnitech Digiscan analyzer and a Apple Macintosh computer equipped with a digital interface board (NB DIO-24, National Instruments, USA).
  • Behavioral data from each motility meter box, representing the position (center of gravity) of the animal at each time were recorded at a sampling frequency of 25 Hz and collected using a custom written LABViewTM application.
  • the data from each recording session were analyzed with respect to distance traveled and small-scale movements, e.g. stops in the center of the behavior recording arena, during the recording session.
  • velocity at each time point is calculated as the distance traveled since the preceding sample divided by the time elapsed since the preceding sample.
  • the number of stops is then calculated as the number of times that the velocity changes from a non-zero value to zero.
  • the number of stops in the center of the behavioral recording arena is calculated as the number of stops occurring at a position at least ten centimeters from the edges of the recording arena.
  • the rats were decapitated and their brains rapidly taken out and put on an ice-cold petri-dish.
  • the limbic forebrain, the striatum, the frontal cortex and the remaining hemispheral parts of each rat were dissected and frozen.
  • Each brain part was subsequently analyzed with respect to its content of monoamines and their metabolites.
  • the monoaminergic indices analyzed were dopamine (DA), 3,4-dihydroxyphenyl-acetic acid (DOPAC), homovanillic acid (HVA), 3-methoxytyramine (3-MT), serotonin (5-HT), 5-hydroxyindole acetic acid (5-HIAA), and noradrenaline (NA).
  • test compounds of this invention were administered to the rat.
  • rats were implanted with one catheter in the jugular vein and one catheter in the carotid artery under ketamine anesthesia.
  • test compound is injected the either orally or in the jugular vein catheter.
  • Blood samples are collected during 8 hours from the arterial catheter.
  • the blood samples were heparinized and centrifuged.
  • Plasma is collected from the centrifuged samples and frozen. The levels of test compound were subsequently determined in each sample by means of gas chromatography mass spectrometry (Hewlett-Packard 5972MSD).
  • the plasma samples taken from the rats of the Sprague-Dawley strain, (0.5 ml) were diluted with water (0.5 ml), and 30 pmol (50 ⁇ l) of (( ⁇ )-S-3-(3-Ethylsulfonylphenyl)-N-n-propyl-piperidine as internal standard was added. The pH was adjusted to 11.0 by the addition of 25 ⁇ l saturated Na 2 CO 3 . After mixing, the samples were extracted with 4 ml dichloromethane by shaking for 20 min. The organic layer was, after centrifugation, transferred to a smaller tube and evaporated to dryness under a stream of nitrogen and subsequently redissolved in 40 ⁇ l toluene for GC-MS analysis.
  • a standard curve over the range of 1-500 pmol was prepared by adding appropriate amounts of test compound to blank plasma samples.
  • GC was performed on a HP-Ultra 2 capillary column (12 m ⁇ 0.2 mm ID), and 2 ⁇ l was injected in the splitless mode. The GC temperature was held at 90° C. for 1 minute following injection, and was then increased by 30° C./min to the final temperature of 290° C. Each sample was run in duplicate. The lowest detectable concentration of test compound was generally found to be 1 pmol/ml.

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US8501777B2 (en) * 2005-10-13 2013-08-06 Nsab, Filial Af Neurosearch Sweden Ab, Sverige 3,5-disubstituted phenyl-piperidines as modulators of dopamine neurotransmission

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